Perovskite ceramic powder and electronic component using same and manufacturing methods thereof

Abstract

A ceramic powder having a perovskite structure is manufactured by synthesizing a ceramic powder by a dry synthesis process and then heat-treating the synthesized ceramic powder in a solution. The dry synthesis method includes a solid phase synthesis method, an oxalate method, a citric acid method and a gas phase synthesis method.

1. Ceramic powder having a perovskite structure, which is obtained by a manufacturing method comprising synthesizing ceramic powder by non-wet synthesis method and heat-treating the synthesized ceramic powder in a solution,
 wherein the ceramic powder has a crystal lattice of a tetragonal system; particles of the ceramic powder are equal to or less than 0.2 μm; a c/a axial ratio of the crystal lattice is equal to or greater than 1.006; and a ratio of area occupied by holes in a single particle of the ceramic powder is equal to or less than 5%, and 
 wherein a particle diameter distribution of the ceramic powder is less than 30%, the particle diameter distribution being standard deviation/mean diameter of particles. 
 
     
     
       2. Ceramic powder having a perovskite structure, which is obtained by a manufacturing method comprising synthesizing ceramic powder by a non-wet synthesis method and heat-treating the synthesized ceramic powder in a solution,
 wherein the ceramic powder has a crystal lattice of a cubic system; particles of the ceramic powder is equal to or less than 0.2 μm; a full-width at half-maximum (FWHM) of an X-ray diffraction (XRD) (111) peak of the crystal lattice is equal to or smaller than 0.270°; and a ratio of area occupied by holes in a single particle of the ceramic powder is equal to or less than 5%, and 
 wherein a particle diameter distribution of the ceramic powder s less than 30%, the particle diameter distribution being standard deviation/mean diameter of particles. 
 
     
     
       3. Ceramic powder having a perovskite structure, wherein the ceramic powder has a crystal lattice of a tetragonal system; particles of the ceramic powder are equal to or less than 0.2 μm; a c/a axial ratio of the crystal lattice is equal to or greater than 1.006; and a ratio of area occupied by holes in a single particle of the ceramic powder is equal to or less than 5%, and
 wherein a particle diameter distribution of the ceramic powder is less than 30%, the particle diameter distribution being standard deviation/mean diameter of particles. 
 
     
     
       4. Ceramic powder having a perovskite structure, wherein the ceramic powder has a crystal lattice of a cubic system; particles of the ceramic powder is equal to or less than 0.2 μm; a full-width at half-maximum (FWHM) of an X-ray diffraction (XRD) (111) peak of the crystal lattice is equal to or smaller than 0.270°; and a ratio of area occupied by holes in a single particle of the ceramic powder is equal to or less than 5%, and
 wherein a particle diameter distribution of the ceramic powder is less than 30%, the particle diameter distribution being standard deviation/mean diameter of particles. 
 
     
     
       5. Ceramic electronic component comprising a dielectric portion made of the ceramic powder of  claim 3  or  4 . 
     
     
       6. A method for manufacturing a ceramic electronic component comprising the step of forming a dielectric portion by employing the ceramic powder of  claim 3  or  4 . 
     
     
       7. A multi-layer ceramic capacitor comprising:
 a dielectric portion made of the ceramic powder of  claim 3  or  4 ; 
 a plurality of internal electrodes whose edges are alternately exposed at two surfaces of the dielectric portion; and 
 a pair of external electrodes formed at surfaces of the dielectric portion to be connected to the exposed edges of the internal electrodes.